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What other than a bad battery would cause terminal corrosion. I had the battery tested at PepBoys, substituted the connectors with stereo grade replacements, and used batterry cleaner, but now a couple weeks later the positive terminal and new connector all all corroded again. Could it be the charging system?
 

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Internal chemical reaction between liquid electrolyte and lead plates result in the formation of Hydrogen gas on the –ve plate and Oxygen on the +ve plate. Un-reacted Oxygen and Hydrogen gasses travel through sulphuric acid and become acidic in characters. They also carry water molecule from electrolyte on the external surface. These acidic gasses combine and react with the terminal clamps and form corrosion. Depending upon the metallic composition of the terminal clamps, various metallic salts are formed. You probably have a battery case with a small leak or a cap that leaks.

I always coat my termincals with Permatex termical corrosion protector. or petroleum jelly.
 
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